A shield slurry multi-phase separation grading device

Abstract

The present application relates to the technical field of waste soil screening, and particularly relates to a shield waste soil multi-phase separation grading device, which aims to solve the problem that various substances in the shield waste soil are not easy to be separately screened and collected in the prior art. The device comprises a screening platform, the screening platform is rotationally connected with an outer screen cylinder and an inner screen cylinder, the inner screen cylinder is inserted into the inner part of the outer screen cylinder, and a spacing exists between the outer peripheral wall of the inner screen cylinder and the inner peripheral wall of the outer screen cylinder to form a material falling space; a plurality of leakage holes are formed in the inner screen cylinder and the outer screen cylinder; a plurality of material falling baffles are formed on the inner screen cylinder, the material falling baffles are arranged in the same circumferential direction of the inner screen cylinder, a through hole is formed in the center of the material falling baffles, and the through hole enables the material falling space and the inner cavity of the inner screen cylinder to be in communication with each other. Through the double-layer screening of the inner screen cylinder and the outer screen cylinder, the rock blocks with different particle sizes can be screened, and the grading precision is improved; the communication structure of the material falling baffles and the through hole enables the material to be guided to a specific area in the inner screen cylinder for screening, and the hole blocking and accumulation are avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of spoil soil screening, and particularly relates to a shield spoil multi-phase separation grading device. BACKGROUND

[0002] The spoil soil generated in the construction process of a shield machine is a mixture formed through processes such as cutterhead cutting, stirring, modification and conveying after stratum excavation. The spoil soil usually contains rock blocks, sand particles and fine mud particles of different particle sizes. According to different construction methods, the shield spoil soil can be divided into two categories: earth pressure balance shield spoil soil and slurry balance shield spoil soil. The former is discharged by a screw conveyor and is in a paste or wet solid state; the latter is discharged through a slurry pipeline and is in a flow or semi-flow state.

[0003] In the treatment process of shield spoil soil, a spoil soil treatment or slurry separation system is often provided on the ground to separate the slurry and solid particles, so as to realize recycling and environmental disposal. However, most of the existing screening devices are designed for classification of a specific particle size range, for example, a vibrating screen, a drum screen or a cyclone separator is used to separate coarse and fine particles in the slurry. Such devices generally have the following disadvantages: the classified particle size range overlaps or is too large, the existing equipment is mainly single or double stage screening, and it is difficult to effectively distinguish large rock blocks, medium-grained sand and small-grained fine sand, so that a large amount of impurities of different particle sizes are still contained in the undersize material, which leads to difficulty in subsequent recycling; secondly, the screening accuracy and fluidity are difficult to balance, the vibrating screen surface is easily clogged under the condition of high water content or high viscosity of the shield spoil soil, and the screening efficiency is sharply reduced; and the recycling and reuse of the spoil soil are limited, most of the current projects only concentrate on the external transportation and disposal of the oversize material, and the rock blocks and sand particles of different particle sizes are not classified and collected, so that the large-diameter rock blocks, recyclable sand and fine mud are mixed and stacked, which not only occupies the stacking space, but also increases the transportation and solidification treatment cost.

[0004] Therefore, it is necessary to provide a shield spoil soil particle size separation treatment device which can realize the particle size separation of shield spoil soil under the conditions of the ground or vehicle loading, automatically classify and separately collect rock blocks and sand particles of different particle sizes, and thus improve the resource utilization rate of the spoil soil and reduce the subsequent disposal and transportation cost. SUMMARY

[0005] The technical problem to be solved by the present application is that the rock blocks and sand particles in the shield spoil soil cannot be effectively separated and collected for subsequent treatment, and the present application provides a shield spoil multi-phase separation grading device which can effectively separate the rock blocks and sand particles in the spoil soil.

[0006] The present application is implemented by the following technical scheme:

[0007] A shield spoil multi-phase separation grading device, comprising:

[0008] The screening platform is provided with an outer screen cylinder and an inner screen cylinder connected in rotation, the inner screen cylinder is inserted into the inner part of the outer screen cylinder, and a spacing exists between the outer peripheral wall of the inner screen cylinder and the inner peripheral wall of the outer screen cylinder and forms a material falling space;

[0009] The inner screen cylinder and the outer screen cylinder are both provided with a plurality of leakage holes;

[0010] A plurality of material falling baffles are formed on the inner screen cylinder, the plurality of material falling baffles are arranged in multiple numbers in the same circumferential direction of the inner screen cylinder, a through hole is formed in the center of the material falling baffle in the direction from the inner screen cylinder to the outer screen cylinder, the through hole allows the material falling space and the inner cavity of the inner screen cylinder to communicate with each other, the material falling baffle is used for circumferentially pushing the material and accelerating the material to fall when rotating upward, and the through hole is used for allowing part of the material to pass through and directly fall into the outer screen cylinder during rotation.

[0011] In the above technical solution, through the double-layer screening of the inner screen cylinder and the outer screen cylinder, primary and secondary screening can be realized at different particle size levels, and the classification accuracy is improved; the material falling space can buffer the movement of the material, so that the sand particles, soil particles and rock blocks are naturally layered in rotation; and the communication structure of the material falling baffle and the through hole allows the material to be guided to a specific area in the inner screen cylinder for screening, so that the hole is prevented from being blocked and accumulated.

[0012] In some optional technical solutions, the through hole includes an inlet and an outlet, the diameter of the inlet is smaller than the diameter of the outlet, and the opening width of the inlet is greater than the diameter length of the leakage hole.

[0013] In the above technical solution, the size of the leakage hole allows the small and medium particle size rock blocks, sand particles and soil particles to pass through the inner screen cylinder preferentially, so that particle size grading screening is realized.

[0014] In some optional technical solutions, the outlet is arranged on the outer surface of the inner screen cylinder, the inlet is located in the inner cavity of the inner screen cylinder, and the two sides of the material falling baffle in the thickness direction are both concave arc surface structures.

[0015] In the above technical solution, a stable one-way discharging channel is formed, so that the waste soil is smoothly discharged under the action of centrifugal force and air flow, the blockage caused by material backflow is avoided, the screening smoothness and the self-cleaning property of the screen hole are improved, and the material falling baffle with the concave arc surface structure can accommodate more waste soil and rise for screening.

[0016] In some optional technical solutions, the height of the material falling baffle is greater than the wall thickness of the inner screen cylinder and smaller than the inner ring radius of the inner screen cylinder.

[0017] In the above technical solution, it is ensured that the material falling baffle has sufficient length to accommodate the dumped waste soil and does not occupy too much screening space.

[0018] In some optional technical solutions, the blanking plates are equidistantly arranged along the circumferential direction of the inner screen cylinder and the number of the blanking plates is odd, and the blanking plates are arranged along the central axis of the inner screen cylinder.

[0019] In the technical solution, the uniform discharge channel array is formed, the screen force and the discharge distribution are balanced, and local load concentration or blockage is prevented.

[0020] In some optional technical solutions, the screen platform is further provided with a gas injection device, the gas injection device is connected with a gas injection pipe extending into the blanking space, and a pipe opening of the gas injection pipe faces the through hole.

[0021] In the technical solution, the airflow injected by the gas injection pipe can periodically sweep the through hole, the soil and sand particles are prevented from being blocked, the separation and movement of the particles are enhanced through the gas injection impact, the sand particles are carried out, the soil is scattered, and the classification effect of the screening is improved.

[0022] In some optional technical solutions, the outer screen cylinder and the inner screen cylinder are coaxially arranged, and the gas injection pipe is arranged directly above the inner screen cylinder.

[0023] In the technical solution, the gas injection pipe is arranged above, the gas injection pipe is prevented from being impacted by the materials in the outer screen cylinder, the soil and sand particles can be blown downward, and the gas injection pipe is prevented from being blocked.

[0024] In some optional technical solutions, an annular groove is formed in the outer circumferential wall of the outer screen cylinder, a dust collection pad is detachably connected in the annular groove, and the dust collection pad is used for temporarily storing the materials falling from the outer screen cylinder.

[0025] In the technical solution, the dust collection pad can temporarily collect the sand particles and soil particles flying with the airflow, and the outflow is prevented.

[0026] In some optional technical solutions, the dust collection pad comprises a first pad layer, a partition layer and a second pad layer arranged in sequence, the partition layer is located between the first pad layer and the second pad layer, a storage cavity is formed in the second pad layer, the first pad layer and the second pad layer are detachably connected, a plurality of mesh holes are formed in the partition layer, and the diameter of the mesh holes is smaller than the diameter of the leakage holes.

[0027] In the technical solution, the dust collection pad with the multi-layer structure has a storage function, the sand particles are isolated in the first pad layer, and the soil particles with a size smaller than the sand particles enter the second pad layer through the partition layer.

[0028] In some optional technical solutions, a plurality of air bags are arranged in the storage cavity, air holes are formed in the air bags, one-way valves are arranged on the air bags, a plurality of extrusion blocks are connected in the annular groove, a winding drum is rotatably connected to the screen platform, a containing groove for containing the dust collection pad is formed in the inner circumferential wall of the winding drum, and the diameter of the winding drum is greater than the diameter of the outer screen cylinder.

[0029] In the above technical solution, the airbag generates periodic micro-airflow when rotating through the breathing action of the one-way valve, which can automatically blow away the powder and mud on the adsorption layer and achieve self-cleaning.

[0030] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0031] 1. The inner and outer screen cylinders arranged coaxially in this invention can retain large-diameter rock pieces in the inner screen cylinder during rotation using a material discharge baffle, while medium and small-diameter rock pieces enter the material discharge space of the outer screen cylinder. Sand and soil particles are also thrown out through the holes into the outer screen cylinder, achieving multi-stage separation and improving screening efficiency.

[0032] 2. The jetting device in this invention can continuously spray airflow into the inner screen cylinder, which can not only blow open the through holes of the material discharge baffle to prevent sand and soil particles from clogging, but also blow off the sand and soil particles adhering to the inner screen cylinder and rocks, thereby achieving cleaning and further screening effects.

[0033] 3. In this invention, a dust collection pad and a roller are added to the outside of the outer screen cylinder, which can effectively prevent sand and soil particles from flying to the outside. At the same time, the dust collection pad can absorb the flying sand and soil particles, complete the collection, and further separate the sand and soil particles. Attached Figure Description

[0034] The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0035] Figure 1 This is a schematic diagram of the structure of the present invention;

[0036] Figure 2 This is a schematic diagram showing the relative positions of the outer screen cylinder, the inner screen cylinder, and the winding cylinder in this invention;

[0037] Figure 3 This is a schematic diagram of the structure of the outer and inner sieve cylinders in this invention. Figure 1 ;

[0038] Figure 4 This is a cross-sectional view of the inner sieve cylinder in this invention;

[0039] Figure 5 This is a schematic diagram of the structure of the outer and inner sieve cylinders in this invention. Figure 2 ;

[0040] Figure 6 This is a schematic diagram of the structure of the roll in this invention;

[0041] Figure 7 This is a cross-sectional view of the dust collection pad in this invention.

[0042] The reference numerals in the attached figures represent:

[0043] 1. Screening platform; 2. Inner screen cylinder; 21. Material discharge baffle; 211. Through hole; 3. Outer screen cylinder; 31. Annular groove; 32. Extrusion block; 4. Leakage hole; 5. Roller; 51. Receiving groove; 6. Dust collection pad; 61. First pad layer; 62. Second pad layer; 63. Partition layer; 64. Airbag; 7. Air jet equipment. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0045] Example 1:

[0046] like Figures 1 to 5 As shown, this embodiment provides a multiphase separation and grading device for shield tunneling waste, comprising:

[0047] Screening platform 1, on which an outer screen cylinder 3 and an inner screen cylinder 2 are rotatably connected. The inner screen cylinder 2 is inserted inside the outer screen cylinder 3. There is a gap between the outer peripheral wall of the inner screen cylinder 2 and the inner peripheral wall of the outer screen cylinder 3 to form a material drop space.

[0048] Both the inner sieve cylinder 2 and the outer sieve cylinder 3 have several perforations 4;

[0049] Several material discharge baffles 21 are formed on the inner screen cylinder 2. Multiple material discharge baffles 21 are spaced apart along the same circumferential direction of the inner screen cylinder 2. A through hole 211 is passed through the center of the material discharge baffle 21 along the direction from the inner screen cylinder 2 to the outer screen cylinder 3. The through hole 211 allows the material discharge space to communicate with the inner cavity of the inner screen cylinder 2. The material discharge baffle 21 is used to push the material circumferentially and accelerate the material falling when rotating and rising. The through hole 211 is used to allow some material to pass through and fall directly into the outer screen cylinder 3 during the rotation process.

[0050] like Figures 2 to 5 As shown, the through hole 211 includes an inlet and an outlet. The diameter of the inlet is smaller than the diameter of the outlet, and the opening width of the inlet is greater than the diameter length of the leakage hole 4.

[0051] like Figure 4 and Figure 5 As shown, the outlet is located on the outer surface of the inner screen cylinder 2, the inlet is located in the inner cavity of the inner screen cylinder 2, and the material discharge baffle 21 has an inwardly concave arc surface structure on both sides along the thickness direction.

[0052] like Figure 4 and Figure 5 As shown, the height of the discharge baffle 21 is greater than the wall thickness of the inner screen cylinder 2, but less than the radius of the inner ring of the inner screen cylinder 2.

[0053] As shown in Figure 4 and Figure 5 The blanking baffle 21 is equidistantly arranged along the circumferential direction of the inner screen cylinder 2 and the number is odd, and a plurality of blanking baffles 21 are arranged along the central axis of the inner screen cylinder 2.

[0054] Specifically, the screening platform 1 can fix the two end faces of the inner screen cylinder 2 and the outer screen cylinder 3 and drive the inner screen cylinder 2 and the outer screen cylinder 3 to rotate. The screening platform 1 comprises a base, a first rotating disc and a second rotating disc. The first rotating disc and the second rotating disc are both driven by a motor and can rotate freely. The second rotating disc can be slidably connected to the base, facilitating the installation and subsequent clamping and fixing of the outer screen cylinder 3. The first rotating disc and the second rotating disc are both provided with annular grooves for clamping and fixing the outer screen cylinder 3 and the inner screen cylinder 2. The driving mode of the screening platform 1 is as follows: the first rotating disc is responsible for controlling the co-rotating of the outer screen cylinder 3 and the inner screen cylinder 2, and the second rotating disc does not rotate and is only used for containing and limiting. The cylindrical outer screen cylinder 3 and the inner screen cylinder 2 can stably and effectively rotate. In the rotating process, the abandoned earth in the inner screen cylinder 2 and the outer screen cylinder 3 will naturally produce a vibration effect. When screening the abandoned earth, the abandoned earth needs to be poured into the inner screen cylinder 2, and then the rock blocks, sand particles and soil of different particle sizes in the abandoned earth are separated step by step.

[0055] The screening process of the embodiment is as follows: one end of the inner screen cylinder 2 and the outer screen cylinder 3 is fixedly installed on the screening platform 1. After the abandoned earth is poured into the inner screen cylinder 2, the other side of the inner screen cylinder 2 and the outer screen cylinder 3 is controlled to continue to be fixed by the screening platform 1, so as to ensure that the inner screen cylinder 2 and the outer screen cylinder 3 remain stable and safe during subsequent rotation. With the rotation of the inner screen cylinder 2 and the accompanying vibration effect, the sand particles and soil particles in the abandoned earth will fall or fly out of the outer screen cylinder 3 through the leakage holes 4 of the inner screen cylinder 2 and the outer screen cylinder 3. The large-particle-size rock blocks in the abandoned earth cannot pass through the leakage holes 4 or the blanking baffles 21 during the rotation of the inner screen cylinder 2 and will continue to rotate in the inner screen cylinder 2 until the screening platform 1 stops running.

[0056] The medium and small particle size rock blocks mixed in the abandoned earth will enter the inlet of the blanking baffle 21 with the rotation and vibration of the inner screen cylinder 2. The opening width of the inlet can allow the medium and small particle size rock blocks to pass through, and then enter the blanking space through the outlet. That is, the medium and small particle size rock blocks are located in the blanking space, and the large particle size rock blocks are located in the inner screen cylinder 2. In subsequent processing, the inner screen cylinder 2 and the outer screen cylinder 3 can be separately disassembled, the medium and small particle size rock blocks in the outer screen cylinder 3 and the large particle size rock blocks in the inner screen cylinder 2 that have been screened can be obtained, the inner screen cylinder 2 and the outer screen cylinder 3 can be operated by means of tools and equipment to be poured, the screened rock blocks can be obtained, and after completing a batch of screening, the inner screen cylinder 2 and the outer screen cylinder 3 can be assembled again for screening.

[0057] It should be noted that the blanking baffle 21 is located inside the inner screen cylinder 2, the height of the blanking baffle 21 is greater than the wall thickness of the inner screen cylinder 2 and less than the radius of the inner circle of the inner screen cylinder 2, when the inner screen cylinder 2 rotates, the spoil will be temporarily contained between two circumferentially adjacent blanking baffles 21, regardless of the clockwise or counterclockwise rotation of the inner screen cylinder 2, when the blanking baffle 21 rotates upward, the spoil contained between two circumferentially adjacent blanking baffles 21 will continue to move upward and will not easily fall off, but will gradually fall off during the process of continuing to move upward, until it is completely located directly above and falls off completely, preferably, both sides of the blanking baffle 21 are concave arc surfaces for containing more spoil; during the above-mentioned falling process of the spoil, the sand particles and soil particles with relatively light texture fall or fly away from the inner screen cylinder 2 faster, and the rock blocks with heavy texture collide with each other or hit the cylinder wall of the inner screen cylinder 2 when falling, causing impact and vibration, which can strip the soil particles attached to the rock blocks, achieving further screening.

[0058] Preferably, in the same circumferential direction of the inner screen cylinder 2, the number of blanking baffles 21 is odd, more preferably, the number of blanking baffles 21 is five, in this arrangement, because the blanking baffles 21 are equidistant, so the center of the two circumferentially adjacent blanking baffles 21 will have another blanking baffle 21 on the opposite side, which can directly fall into the inlet of the blanking baffle 21 on the opposite side when the above-mentioned spoil moves upward and falls off, allowing sand particles, soil particles, medium and small particle size rock blocks to be further quickly separated from the inner screen cylinder 2, increasing the screening efficiency.

[0059] Embodiment 2:

[0060] As shown in Figure 1 and Figure 5 , the screening platform 1 is also provided with a gas injection device 7, the gas injection device 7 is connected with a gas injection pipe extending into the blanking space, and the pipe opening of the gas injection pipe faces the through hole 211.

[0061] As shown in Figure 5 , the outer screen cylinder 3 is coaxially arranged with the inner screen cylinder 2, and the gas injection pipe is arranged directly above the inner screen cylinder 2.

[0062] As shown in Figure 1 and Figure 5 , the gas injection device 7 is arranged on the second rotating disc of the screening platform 1, which is convenient for installing the outer screen cylinder 3 and the inner screen cylinder 2 on the first rotating disc in the early stage, and the second rotating disc remains stationary and is still used for limiting.

[0063] Specifically, the outer screen cylinder 3 is coaxially arranged with the inner screen cylinder 2, and the distances between the material falling spaces are equal. After the medium and small particle size rock blocks and the sand and soil particles are screened out by the inner screen cylinder 2, the rock blocks and the sand and soil particles fall on the outer screen cylinder 3. During the rotation of the outer screen cylinder 3, the material does not rise, but the sand and soil particles are continuously screened out by the leakage holes 4. The medium and small particle size rock blocks maintain a stable height in the material falling space and continuously vibrate.

[0064] The screening platform 1 is provided with a gas jetting device 7. The gas jetting device 7 can jet out a gas flow through a gas jetting pipe. The nozzle of the gas jetting pipe is arranged above the inner screen cylinder 2 and is not limited by the material in the material falling space. The gas jetting pipe can intermittently or continuously jet gas to the inner screen cylinder 2 during the rotation of the inner screen cylinder 2. The gas flow can blow off the sand and soil particles on the leakage holes 4 of the inner screen cylinder 2, avoid the blockage, and blow to the passing material falling baffle 21 to clean the sand and soil particles attached to the material falling baffle 21, improve the screening quality, and when the jetted gas flow is strong, the medium and small particle size rock blocks that may be blocked in the material falling baffle 21 can be jetted and knocked off. These rock blocks can completely fall off under the vibration of the jetted gas flow and the inner screen cylinder 2, and are not easy to be blocked.

[0065] Embodiment 3

[0066] As shown in Figure 2 and Figure 3 , the outer circumferential wall of the outer screen cylinder 3 is provided with an annular groove 31. A dust collection pad 6 is detachably connected in the annular groove 31. The dust collection pad 6 is used for temporarily storing the material falling from the outer screen cylinder 3.

[0067] As shown in Figure 7 , the dust collection pad 6 comprises a first pad layer 61, a partition layer 63 and a second pad layer 62 arranged in sequence. The partition layer 63 is located between the first pad layer 61 and the second pad layer 62. A storage cavity is formed in the second pad layer 62. The first pad layer 61 and the second pad layer 62 are detachably connected. A plurality of mesh holes are formed in the partition layer 63. The diameter of the mesh holes is smaller than the diameter of the leakage holes 4.

[0068] As shown in Figure 2 , Figure 6 and Figure 7 , a plurality of air bags 64 are arranged in the storage cavity. Air holes are formed in the air bags 64. A one-way valve is arranged on the air bag 64. A plurality of extrusion blocks 32 are connected in the annular groove 31. A winding drum 5 is rotatably connected to the screening platform 1. A containing groove 51 for containing the dust collection pad 6 is formed in the inner circumferential wall of the winding drum 5. The diameter of the winding drum 5 is greater than the diameter of the outer screen cylinder 3.

[0069] Specifically, the screening platform 1 is also rotatably connected with a winding drum 5, and the first rotating disc and the second rotating disc are also correspondingly provided with annular grooves for limiting and clamping the winding drum 5, the inner circumferential wall of the winding drum 5 is provided with a containing groove 51, and the outer circumferential wall of the outer screen drum 3 is provided with an annular groove 31, both the containing groove 51 and the annular groove 31 are used for containing a dust collecting pad 6, the dust collecting pad 6 is in a sheet shape and can be wound into a cylindrical shape and installed in the containing groove 51; preferably, the winding drum 5 itself can be detachably divided into two semicircular mounting rings, and the two mounting rings can be clamped with each other, thereby facilitating installation.

[0070] After the inner screen drum 2 and the outer screen drum 3 are installed, the dust collecting pad 6 is installed in the containing groove 51 of one of the mounting rings and is sleeved and installed at the top of the outer screen drum 3, and finally the other mounting ring is clamped, so that the installation of the winding drum 5 is completed, the diameter of the winding drum 5 is greater than that of the outer screen drum 3, and after the installation of the winding drum 5 is completed, there is a gap between the bottom surface of the winding drum 5 and the bottom surface of the outer screen drum 3, so that the sand particles and the soil particles falling through the leakage holes 4 of the outer screen drum 3 can be temporarily stored.

[0071] In the embodiment, the screening platform 1 rotates, and the inner screen drum 2 and the outer screen drum 3 work according to the processes in the embodiment 1 and the embodiment 2, the sand particles and the soil particles of the inner screen drum 2 enter the outer screen drum 3, and the sand particles and the soil particles of the outer screen drum 3 are adsorbed and blocked by the dust collecting pad 6, so that the sand particles and the soil particles can be effectively prevented from flying to the outside and can be collected.

[0072] Preferably, the inner screen drum 2 and the outer screen drum 3 rotate in the same direction, the winding drum 5 rotates in the opposite direction of the outer screen drum 3, the winding drum 5 can be installed on the second rotating disc and is limited by the first rotating disc after the second rotating disc moves, and it needs to be noted that in the embodiment, the annular groove of the second rotating disc where the winding drum 5 is located can be reversed relative to the first rotating disc, but the center of the second rotating disc, i.e., the outer screen drum 3 and the inner screen drum 2, is still fixed, in this way, the winding drum 5 can be reversed relative to the outer screen drum 3, and the winding drum 5, the outer screen drum 3 and the inner screen drum 2 can be effectively fixed, and the air jet device 7 is also in a fixed state and will not be impacted by the discarded soil.

[0073] When the two are rotating, the dust collecting pad 6 is effectively limited in the accommodating groove 51 by the winding drum 5, the annular groove 31 of the outer screen cylinder 3 also continuously clamps the dust collecting pad 6, thereby making the dust collecting pad 6 not easy to fall off and deform during rotation; the extrusion blocks 32 of the outer screen cylinder 3 are spirally arranged, and there is a spacing between the circumferentially adjacent extrusion blocks 32. During movement, the extrusion blocks 32 can intermittently extrude the air bags 64 in the dust collecting pad 6. The air bags 64 are in a full state under normal circumstances, and will exhaust after being extruded through the one-way valve, blowing the sand particles and soil particles falling on the first pad layer 61. After the extrusion blocks 32 leave, the air bags 64 restore by inhaling, and can adsorb the soil particles with lighter texture than sand particles in the position area. The adsorbed soil particles will pass through the partition layer 63 into the second pad layer 62, but will not enter the inside of the air bags 64. A plurality of grooves can be formed on the first pad layer 61 for temporarily storing sand particles.

[0074] After the screening is completed, the screening platform 1 is stopped, the winding drum 5 and the dust collecting pad 6 are disassembled, the wound dust collecting pad 6 is unfolded, and the sand particles are stored on the bottom and the first pad layer 61. The dust collecting pad 6 can be poured to concentrate the collection of sand particles, and then the dust collecting pad 6 can be disassembled. The second pad layer 62 is struck or hammered at the soil particle collection point to make the soil particles fall off, and the collection of sand particles and soil particles is completed.

[0075] Embodiment 4:

[0076] This embodiment relates to the screening process steps of shield spoil soil. The useful waste in the shield spoil soil is screened and processed step by step for recycling.

[0077] The shield spoil soil is transported to the screening platform 1 by the belt conveyor, the screening platform 1 is installed with the inner screen cylinder 2 and the outer screen cylinder 3 according to the content of embodiment 1, then a part of the spoil soil is put into the inner screen cylinder 2, and then the dust collecting pad 6 and the winding drum 5 are installed according to the content of embodiment 3. After the installation is completed, the screening platform 1 is adjusted to clamp and fix the two sides of the outer screen cylinder 3 to keep stable rotation.

[0078] The large-diameter rock blocks and the medium and small-diameter rock blocks are screened out at the screening platform 1 and are respectively stacked and stored on the specified construction site. The screened soil particles are put into the sewage transfer tank, and the sand particles are sent into the spiral sand washer. The sand particle mixture cleaned by the spiral sand washer is sent into the tailings recovery all-in-one machine. The construction site is provided with a clean water tank, and the water in the clean water tank can be used for cleaning the sand particles by the spiral sand washer and providing clean water for washing the tailings recovery all-in-one machine. After the screening platform 1 is screened for multiple times, the components such as the outer screen cylinder 3 and the inner screen cylinder 2 can also be cleaned with clean water, but the dry state of the multi-phase separation grading device and the discharged material in the application needs to be maintained during operation.

[0079] The tailings recycling integrated machine separates clean fine sand particles and sewage mixture, the fine sand particles are also collected and can be recycled; the sewage mixture and the soil particles separated by the screening platform 1 are all put into the sewage transfer tank, and after the reagent is put into the sewage treatment tank through the slurry pump, the sewage treatment tank clarifies the sewage mixture into supernatant and slurry, the supernatant can flow back into the clean water tank, and the slurry is sent into the filter press through another slurry pump, the filter press processes the slurry into mud cake which is convenient to store, and the slurry which cannot be filtered will be put back into the sewage treatment tank for recycling treatment again; finally, the fine sand particles, two kinds of rock blocks with different particle sizes obtained by screening and mud cake can be transported to other sites by the transport vehicle for recycling.

[0080] The rock blocks, sand particles and soil particles are separated in advance by the screening platform 1, which can greatly shorten the time in the subsequent engineering, improve the work efficiency and the recycling quality.

[0081] The above specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present application, and it should be understood that the above description is only a specific embodiment of the present application and is not used to limit the protection scope of the present application, and any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A shield slurry multi-phase separation and classification apparatus, characterized in that, include: Screening platform (1), on which an outer screen cylinder (3) and an inner screen cylinder (2) are rotatably connected. The inner screen cylinder (2) is inserted inside the outer screen cylinder (3). There is a gap between the outer peripheral wall of the inner screen cylinder (2) and the inner peripheral wall of the outer screen cylinder (3) to form a material drop space. Both the inner sieve cylinder (2) and the outer sieve cylinder (3) have several perforations (4). Several material discharge baffles (21) are formed on the inner screen cylinder (2). Multiple material discharge baffles (21) are spaced apart along the same circumferential direction of the inner screen cylinder (2). Through holes (211) are formed through the material discharge baffles (21) in the direction from the inner screen cylinder (2) to the outer screen cylinder (3). The through holes (211) allow the material discharge space to communicate with the inner cavity of the inner screen cylinder (2). The material discharge baffles (21) are used to push the material circumferentially and accelerate the material falling when rotating and rising. The through holes (211) are used to allow some material to pass through and fall directly into the outer screen cylinder (3) during rotation. An annular groove (31) is provided on the outer peripheral wall of the outer screen cylinder (3). A dust collection pad (6) is detachably connected inside the annular groove (31). The dust collection pad (6) is used to temporarily store the material that falls from the outer screen cylinder (3). The dust collection pad (6) includes a first pad layer (61), a partition layer (63), and a second pad layer (62) arranged in sequence. The partition layer (63) is located between the first pad layer (61) and the second pad layer (62). A storage cavity is formed in the second pad layer (62). The first pad layer (61) and the second pad layer (62) are detachably connected. The partition layer (63) has a plurality of mesh holes, and the diameter of the mesh holes is smaller than the diameter of the leakage hole (4). The storage cavity is provided with several air bladders (64), each air bladder (64) has an air hole and a one-way valve. Several extrusion blocks (32) are connected in the annular groove (31). A roller (5) is also rotatably connected to the screening platform (1). A receiving groove (51) for accommodating the dust collection pad (6) is provided on the inner peripheral wall of the roller (5). The diameter of the roller (5) is larger than the diameter of the outer screen cylinder (3).

2. A shield debris multi-phase separation classification device according to claim 1, wherein: The through hole (211) includes an inlet and an outlet. The diameter of the inlet is smaller than the diameter of the outlet, and the opening width of the inlet is greater than the diameter length of the drain hole (4).

3. A shield spoil multi-phase separation grading device according to claim 2, wherein: The outlet is located on the outer surface of the inner screen cylinder (2), the inlet is located in the inner cavity of the inner screen cylinder (2), and the material discharge baffle (21) has an inwardly concave arc surface structure on both sides along the thickness direction.

4. The shield debris multi-phase separation classification apparatus of claim 2, wherein: The height of the material discharge baffle (21) is greater than the wall thickness of the inner screen cylinder (2) and less than the inner radius of the inner screen cylinder (2).

5. The shield tunneling waste multiphase separation and grading device according to claim 1, characterized in that: The material discharge baffles (21) are equidistantly arranged along the circumference of the inner screen cylinder (2) and the number of them is odd. Several of the material discharge baffles (21) are arranged in an array along the central axis of the inner screen cylinder (2).

6. The shield tunneling waste multiphase separation and grading device according to claim 1, characterized in that: The screening platform (1) is further provided with a jet equipment (7), the jet equipment (7) is connected with a jet pipe extending into the blanking space, and the nozzle of the jet pipe faces the through hole (211).

7. The shield debris multi-phase separation grading device according to claim 6, characterized in that: The outer sieve cylinder (3) and the inner sieve cylinder (2) are coaxially arranged, and the jet pipe is arranged directly above the inner sieve cylinder (2).

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